feat(cpp): gaia-bash — native C++ bash coding agent with TUI, API server, MCP server#985
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kovtcharov-amd wants to merge 10 commits into
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feat(cpp): gaia-bash — native C++ bash coding agent with TUI, API server, MCP server#985kovtcharov-amd wants to merge 10 commits into
kovtcharov-amd wants to merge 10 commits into
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added 4 commits
May 6, 2026 11:27
…ls, REPL, TUI, sessions Before: the C++ framework had an agent loop, LLM client, and tool registry but lacked file I/O tools, process execution, interactive REPL, session persistence, and a reactive TUI. Example agents used ad-hoc popen wrappers and blocking getline loops. After: six new reusable framework components that any C++ agent can plug into: - ProcessRunner: cross-platform command execution with timeout, output capping - FileIOTools: file_read, file_write, file_edit, file_search with security policies - GitTools: read-only git status/diff/log/show with shell injection prevention - SessionStore: JSON-based conversation persistence with save/load/resume - ReplRunner: two-thread REPL with slash commands, Ctrl-C cancel, session auto-save - TuiConsole: FTXUI-based reactive console with markdown rendering and streaming Also adds: tool argument schema validation in ToolRegistry, agent cancel support (requestCancel/isCancelled), history() accessor, FTXUI FetchContent in CMake.
…framework Before: the C++ framework had reusable components (M1) but no production agent binary. No way for external tools to interact with GAIA C++ agents. After: complete gaia-bash coding agent with five interfaces: - Interactive TUI (default): FTXUI fullscreen with markdown, streaming, slash cmds - Single query: gaia-bash "write a backup script" - REST API server (--serve): OpenAI-compatible /v1/chat/completions, /v1/tools - MCP stdio server (--mcp): JSON-RPC for Claude Code / OpenCode integration - Pipe mode (--print): stdout-friendly for CI/scripting Agent tools: bash_execute (with shell detection), env_inspect, plus framework tools (file_read/write/edit/search, git_status/diff/log/show). Eval framework: 25 scenarios across 5 categories (script writing, review, tool usage, error handling, POSIX compliance) with ground truth validation and a Python adapter for the gaia eval harness.
… linking Three build fixes found during first real MSVC compilation: 1. NOMINMAX: Windows min/max macros collide with std::min — define NOMINMAX before windows.h include in process.cpp. 2. Threaded pipe reading: the original sequential approach (read pipes then wait for process, or wait then read) either deadlocked on timeout tests or lost output on large-output tests. Fix: read stdout/stderr in std::thread workers concurrently with WaitForSingleObject. 3. FTXUI linking for tests: test_tui_console.cpp includes FTXUI headers but tests_mock only linked gaia_core (which has FTXUI as PRIVATE). Added explicit ftxui::component/dom/screen link to tests_mock when GAIA_BUILD_TUI is ON. Result: 431/435 tests pass on Windows MSVC 2022. The 4 failures are pre-existing WiFiToolsTest issues unrelated to this work.
The --serve and --mcp flags were stubs printing "not yet implemented".
Now they create real ApiServer and McpServer instances wired to a BashAgent.
MCP mode auto-allows all tool confirmations since the external agent
(Claude Code, OpenCode) handles safety decisions. Verified end-to-end:
echo '{"jsonrpc":"2.0","id":1,"method":"tools/call",
"params":{"name":"bash_execute",
"arguments":{"command":"echo hello"}}}' | gaia-bash --mcp
→ {"stdout":"hello\n","exit_code":0}
The bash agent's system prompt and 10 tool descriptions need 32K context. Without this, the first LLM call hit "context size exceeded" and had to retry. - Set contextSize = 32768 in all three config creation points (interactive, serve, MCP modes) in main.cpp - Add "bash" AgentProfile to AGENT_PROFILES in lemonade_client.py so gaia init knows the right context size for the bash agent
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This was referenced May 18, 2026
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added 3 commits
May 20, 2026 15:56
1. bash_tools.cpp: output truncation now reserves space for the truncation message so total never exceeds MAX_OUTPUT_BYTES (32KB). 2. bash_eval_adapter.py: fixed success=True on HTTP errors (exception handlers now set success=False). Added missing validations for expected_tools, tool_args_must_contain, expect_error, expect_nonzero_exit, and expect_timeout ground truth fields. 3. bash_ground_truth.json: fixed bash-write-dedup expected_tools to include both file_write and bash_execute (matching the scenario).
WiFi tool tests were asserting handler-level error strings but the framework's
parameter validation now runs first, producing a different message format.
Updated tests to use HasSubstr("missing required parameter") matching.
FTXUI shared library: force FTXUI to build static even when BUILD_SHARED_LIBS=ON
since FTXUI doesn't export DLL symbols, causing LNK1181 on Windows.
Install test: disable TUI for the find_package round-trip since FetchContent'd
FTXUI targets can't be re-exported in the install tree.
…bUI integration gaia-bash needed a structured output mode for driving a TUI or WebUI frontend. --json-events emits JSONL events to stdout (thought, goal, tool_call, answer, etc.) so a parent process can render them. --query pairs with it for single-shot use. - JsonEventOutputHandler: OutputHandler subclass that serializes agent events as one-JSON-object-per-line to an ostream (default stdout) - structuredEvents config flag: emits parsed events even during streaming so the frontend gets both live tokens AND structured agent activity - GTest::gmock added to test link (used by HasSubstr matchers in WiFi tool tests)
This was referenced May 21, 2026
The `--json-events` answer event was missing token usage data, so the TUI/WebUI had no visibility into how many tokens each query consumed. Now the answer event includes a `usage` object with `prompt_tokens`, `completion_tokens`, and `total_tokens` — accumulated across all LLM calls in a multi-step query — so the frontend can render token consumption directly from the event stream. ## Test plan - [ ] `tests_mock --gtest_filter="JsonEventHandlerTest.*"` — all 23 tests pass (2 new: `FinalAnswerWithUsage`, `FinalAnswerZeroUsageOmitted`) - [ ] `gaia-bash.exe --json-events --query "what is 2+2?"` — verify `answer` event includes `usage` when Lemonade returns it - [ ] `gaia-bash.exe --json-events --query "hello"` — verify `usage` key is omitted when server returns zero tokens (graceful degradation) Closes #1205 Co-authored-by: Ovtcharov <kovtchar@amd.com>
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May 28, 2026
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Reviewed at a structural/triage level given the size and language (no C++ toolchain here to build). This is a well-isolated new subsystem: 47 of 52 files live under cpp/, it ships a design doc (docs/plans/bash-agent.mdx) and a CI workflow, has gtest coverage, and touches the existing Python package in only one place (lemonade_client.py, +7 lines). No collisions with the Python agents. Approving; deep line-level C++ review and a build/test run would be a good gate to add in CI before this becomes load-bearing.
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Why this matters
Before: the GAIA C++ framework had an agent loop, LLM client, and tool registry — but no production CLI agent, no interactive TUI, no file I/O tools, no session persistence, and no way for external tools (Claude Code, OpenCode) to use GAIA agents.
After:
gaia-bashis a fully functional native binary bash coding agent with five interfaces — interactive TUI, single-query CLI, pipe mode, REST API server, and MCP stdio server — plus a reusable C++ framework that any future agent can build on.Verified: builds on Windows MSVC 2022, 431/435 tests pass (4 pre-existing WiFi test failures), MCP protocol tested end-to-end (
tools/list,tools/call,prompts/list).Threads
/v1/chat/completions,/v1/tools) and MCP stdio server (JSON-RPCtools/list,tools/call,prompts/list) for Claude Code / OpenCode integrationTest plan
cmake -B build && cmake --build buildon Windows MSVC 2022 — compiles cleantests_mock.exe— 431/435 pass (4 pre-existing WiFi failures)gaia-bash --help— prints usageecho '{"method":"initialize"}' | gaia-bash --mcp— MCP handshake worksecho '{"method":"tools/list"}' | gaia-bash --mcp— returns 10 tools with JSON Schemaecho '{"method":"tools/call","params":{"name":"bash_execute","arguments":{"command":"echo hello"}}}' | gaia-bash --mcp— executes command, returns stdout/v1/chat/completions(needs Lemonade Server)